Thermophoric mixture.



UNITED STATES PATENT OFFICE.)

NIGNAZ TIMAR, or BERLIN,- GERMANY, ASSIGNOR TO FRITZ AHEILIGVER, oF.

ANDERNAOH, GERMANY.

THERMOPHORlC-MIXTURE.

SPECIFICATION forming part of Letters Patent No. 726,204, dated April 21, 1903. Application filed January 9,1903. $erial No. 13 8,420. (No specimens.)

To all whom, it may concern.-

Be it known that I, IGNAZ TIMAR, manufacturer, a citizen of Germany, and a subject of the King of Prussia and Emperor of Germany, residing at Berlin, Tempelhofer Ufer 1 in the Kingdom of Prussia and Empire of Germany, have invented certain new and useful Improvementsin Thermophoric Mixtures, of which the following is a full, clear, and exact description.

The storage of heat by means of salts which readily melt or liquefy according to the methods hitherto usually employed is based upon the fact that a mixture of crystalline salts gradually gives off the heat which it has absorbed in melting upon recrystallization.

As the salts employed in many cases are capable of absorbing a considerable quantity of heat, such a so-called thermophore mixture placed in a suitable container or receptacle acts as an accumulator of heat of great capacity.

In connection with the application of this invention, more particularly to thermophores or receptacles with soft and elastic sides-as,- for instance, for hot illows or bolsters and the likedefects have beco "evident which are mainly attributable to the chemical and physical character of the salt employed. These defects are, first, a disagreeable pungent odor, which interferes with the use of the'thermophores for sick persons, and, second, the whole salt mixture in crystallizing forms into hard lumps, which cut or damage the sides of its container or receptacle if constructed of a soft substance, as india-rubber. Attempts have been made to obviate these defects by the addition of glyc i p to the salt, so as to prevent the formation of lumps. As a consequence, when glycerin is employed the salt crystallizes out in a sand-like form, and in course of time the sharp small crystals damage the elastic or soft material of the sides of the thermophoreas,for instance, india-rubber-to a considerable extent. It has also been proposed to employ farinaceous vegetable admixtures-as, for instance, t'o a'dd decoct10 n s o,l1f n see dto the thermophore mass,

According to the present invention the I avoidance of damage to the sides of the thermophore and the obviation of unpleasant odors are effected by adding to the thermophore mass a special kind of vegetable-seed, which is distinguished by a fat which does not affect india-rubber and other substances and bya pungent odor, which, however, is not unpleasant. sunflower-seed, also the so-called Greek hay (1 mm Grcecmm) the effect of which is that the salt mixture crystallizes out into a soft mortar-like consistency, which in addition to being suitable for metal containers is also suitable for thermophores made of india-rubber and similar materials by reason of its soft consistency, as it will not out or damage such casings. The odorof such vegetable products as Foenum Gra'acum, moreover, possesses the property of covering or nullifying odors from the substance employed as the thermophore salt-as, for instance, sodium acgtate, the odor from which is disagreeable.

The seed which is employed according to my invention is dissolved in hot water and mixed with the thermophore salt to the extent of about six to seven per centum of the whole bulk.

What I claim, and desire to secure by Letters Patent, is-

1. A thermophoric mixturecontaining vegetable-seeds which furnish viscous substances and a fat which will not affect india-rubber and the like, such as sunflower-seed and Greek hay-seed, (Focmtm Grcecum,) substantially as described.

Such seed, for instance, is the In witness whereof I subscribe my signa- 2. Athermophoric mixture comprisingtherture in presence of two witnesses.

mophoric salt, dissolved sunflower-seed,

Greek hay-seed (Famum Gwecum) or simir r lar vegetable-seeds which contain viscous sub- IGNAA HMAR' 5 stances and a fat which will not affect india- Witnesses:

rubber and the like material, substantially HENRY HASPER,

WOLDEMAR HAUPT.

as and in the proportions specified. 

